Hi @astoz ,
Did you mean that you can't view your custom connector icon in powerbi , right? If so, please check whether you Allow any extension to load without warning or validation in Option-Security in desktop. And you also need to build the project to produce an extension file, then copy the extension file into the [Documents]\Power BI Desktop\Custom Connectors directory. You could refer to https://github.com/Microsoft/DataConnectors for details.
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.